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Which of the following include guidelines for creating tables in a relational database?

Which of the following include guidelines for creating tables in a relational database?

Which of the following include guidelines for creating tables in a relational database?

(a)Only one table in the database needs a primary key
(b)The primary key need not be unique
(c)Attributes may appear in several tables
(d)Data must be atomic.
(e)The secondary key need to be unique.

Johnson 29-Dec-2017

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